http://localhost:8080/handle/123456789/2720 Sat, 18 Apr 2026 14:12:55 GMT 2026-04-18T14:12:55Z http://localhost:8080/handle/123456789/4312 EFFECT OF DIFFERENT LEVELS OF SEED INFECTION (Bipolaris sorokiniana) AND PLANT POPULATION DENSITY ON LEAF BLIGHT SEVERITY AND YIELD OF WHEAT ISLAM, MD. NURUL The experiment was conducted during the period from May 2011 to April 2012 to find out the effect of seed infection levels and plant population density on leaf blight severity and yield of wheat. Three population density viz. 200 seed/m/, 300 seed/m2 and 400 seed/nr' and six seed infection levels viz. 0%, 5.1 - 15%, 15.1 - 25%, 25.1 - 35%, 35.1 - 45% and 45.1-60% were used. Maximum leaf spot severity in flag leaf stage (0.36), panicle initiation stage (0.64), flowering stage (1.57), milk stage (1.84) and hard dough stage (2.30) was found in the interaction between sowing seeds @ 400 seeds/rrr' with 45.160% seed infection level. In every growth stage of the plant significantly lower leaf blight severity was recorded in the interaction between 200 seeds/nr' with sowing of 0.0% infected seeds. Similar trends in disease severity were recorded on penultimate leaf in above mentioned growth stage. Significantly higher number of grains/ear (58.00) and healthy grains/ear (55.67) was recorded under the treatment TI (0% seed infection) with a seed rate of 200 seeds/m/. Lower number of diseased grains/ear (2.33) were recorded under the treatments T6 with 400 seeds/m/ and Tl with 200 seeds/m'. Weight of diseased grains/ear ranged from 0.07 g to 0.75 g where the lowest value was recorded under Tt X 200 seeds/nr' treatment combination. Significantly higher (45.60) grain weight of 1000 seeds was recorded under the treatments TI (0% seed infection) with a seed rate of 200 seeds/mi. Straw yield under different treatment combinations ranged from 3.17-4.21 t/ha where the highest straw yield was obtained under the treatment combination of TI X 200 seeds/mi. Grain yield was significantly the highest (3.43 t/ha) when healthy seeds (0% infection) were sown @ 200 seeds/m'. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in Partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN PLANT PATHOLOGY Sat, 01 Jan 2011 00:00:00 GMT http://localhost:8080/handle/123456789/4312 2011-01-01T00:00:00Z http://localhost:8080/handle/123456789/4311 STUDY ON LEAF BLIGHT DISEASE (PSEUDOMONAS SP) OF LITCHI (LITCHI CHINENSIS) IN SELECTED AREAS OF BANGLADESH AND IT'S MANAGEMENT AMIN, TANlA The existing health situation of seedlings of litchi and management strategies of nursery diseases of seedlings of litchi species in the country is in a stage to be upgraded for successful fruit production to meet the national demand. Four experiments were carried out during 2010 to 2012 to study the status of leaf blight on seedlings of litchi, effect of weather parameters on the incidence of seedling diseases of litchi in different growing areas of Bangladesh with development of an environment friendly disease management practice. Important plant pathogen Pseudomonas sp was detected and identified by morphological study and by different biochemical test. Incidence and severity of leaf blight of litchi at seedling stage were studied and significant variations were observed that depends on weather factors. Occurrence of leaf blight was correlated with temperature, rain fall and relative humidity. Comparative effectiveness of BAU-biofungicide applied in the soil at the time of pot preparation as well as foliar spray and three fungicide viz. Indofil M-45, Bavistin 50 WP and Cupravit 50 WP were evaluated on litchi against leaf blight in the nursery. Among the treatments applied, Cupravit 50 WP showed better result in controlling leaf blight of litchi. BAU-Biofungicide, is also used as an alternate to chemicals can successfully be used. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in Partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN PLANT PATHOLOGY Sat, 01 Jan 2011 00:00:00 GMT http://localhost:8080/handle/123456789/4311 2011-01-01T00:00:00Z http://localhost:8080/handle/123456789/4308 CONTROL OF RHIZOME ROT OF GINGER THROUGH SELECTED CHEMICALS, BIOAGENT, PLANT EXTRACTS AND SOIL AMENDMENTS HASNAT, MAHMUDA Experiments were carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during March, 2011 to February 2012 to findout the efficacy of selected treatments viz. TI (Bavistin 50WP ), T2 (Ridomil Gold), T3 ( Dithane M-45 ), T4 ( Sulcox), Ts (Neem leaf extracts), T6 ( Alamonda leaf extracts), T, (poultry waste), Ts (Saw dust), T9 (Trichoderma harzianumy and untreated control for controlling rhizome rot of ginger caused by Fusarium oxysporum. In in-vitro assay the highest inhibition (86.33%) of mycelial growth of Fusarium oxysporum was observed in case of Bavistin 50 WP followed by Ridomil Gold MZ72 (83.77%), Dithane M-45 (82.66%), Trichoderma harzianum (81.11 %), alamanda leaf extract (77.7%), Sulcox (76.77%) and neem leaf extract (76.0%). In in-vivo assay the lowest disease incidence (27.78%) was recorded in case of T2 (Ridomil Gold) preceded by T, (poultry waste) (30.55%), T3 (Dithane M-45 ) (33.33%), TI (Bavistin 50WP ) (33.33%) and r, (Saw dust) (36.11 %) at 240 DAP (Days After Planting) while the highest disease incidence was recorded in control (63.89%) preceded by T4 (Sulcox) (38.89%) and T, (Neem leaf extracts) (38.89 %). All the treatments effect was found statistically significant in comparison to control. The highest reduction of disease severity (61.25 %) was recorded at 240 DAP in case of T7 followed by T2(58.34 %). The highest percentage of healthy tillers per plot was noted in case of treatment T7 (81.91%) which was statistically similar with TI, T2,Ts and Ts. The highest plant height (51.11 em) was recorded in case of treatment TI where rhizomes were treated with Bavistin 50 WP followed by foliar spray with the same. The second highest plant height was recorded in (50.89 em). The highest weight (2520.00 g) of the healthy rhizome was recorded in case of treatment T7.The highest rhizome yield (14.38 t/ha) was recorded in case of T7 which was 50.33% increased over control. Poultry waste as soil amendment, neem or alamonda leaves as plant extracts, Trichoderma harzianum as bio agent and Bavistin or Ridomil Gold as fungicide t could be used to control rhizome rot of ginger. .ft. 'l1iesis su6mitttd'ro tlie P'aculty of.ft.Oricufture, SIier-e43aTlfJra.ft.gricufturaf VniversityJ (j)1ia~ in partialful.filImmt of tlie ~quimnents for tlie degree of MASTER OF SCIENCE IN PLANT PATHOLOGY Sat, 01 Jan 2011 00:00:00 GMT http://localhost:8080/handle/123456789/4308 2011-01-01T00:00:00Z http://localhost:8080/handle/123456789/4307 STUDY ON SEEDLING DISEASES OF COCONUT (Cocos nucifera L.) IN SELECTED LOCATION OF BANGLADESH AND THEIR MANAGEMENT ANIKA, SHAMS Seedlings diseases of coconut and the effect of weather parameters on the diseases were studied during 2010 to 2012 in different growing locations of Bangladesh with an effort to development a suitable disease management practice. Important plant pathogens Pestalotia sp., Cercospora sp., Curvularia sp. and Phytophthora sp. were detected and identified as causal agent of leaf spot and leaf blight diseases of coconut seedlings. Disease incidence and severity observed higher in Dhaka than Khulna in different nursery surveyed. Effect of weather parameters on incidence and severity of diseases were studied and significant variations were observed. The highest disease incidence (84.60%) and severity (33.74%) was recorded by the effect of Pestalotia sp. And the lowest disease incidence (2.25%) and severity (2.83%) was recorded by the effect of Phytophthora sp. Temperature, relative humidity and rainfall act as parameter in this study. The highest disease incidence and severity occurred in the month of April and July and the lowest in December. Effectiveness of four chemical fungicides viz. Cupravit 50 WP, Mancozeb, Ditbane M-45 and Bavistin 50 WP were evaluated on coconut seedling diseases in the nursery. Among the treatments applied Cupravit 50 WP and Dithane M-45 showed better result than Mencozeb and Bavistin in controlling disease incidence and severity of leaf spot and leaf blighted diseases of coconut. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PLANT PATHOLOGY Sat, 01 Jan 2011 00:00:00 GMT http://localhost:8080/handle/123456789/4307 2011-01-01T00:00:00Z